Study on steam generator tube wastage mechanism by liquid droplet impingement erosion, 3; Temperature and pressure measurement of two-phase free jet

液滴衝撃エロージョンによる蒸気発生器伝熱管におけるウェステージ現象に関する研究; 二相自由噴流の圧力及び温度測定

吉田 篤郎*; 東 侑麻*; 奈良林 直*; Khoo Chong Weng, W.*; 新榮 邦彦*; 辻 雅司*; 大島 宏之; 栗原 成計 

Yoshida, Atsuro*; Higashi, Yuma*; Narabayashi, Tadashi*; Khoo Chong Weng, W.*; Arae, Kunihiko*; Tsuji, Masashi*; Ohshima, Hiroyuki; Kurihara, Akikazu

本研究は、ナトリウム冷却型高速炉蒸気発生器で生じうるウェステージ現象を定量評価するため、破損伝熱管の開口部から隣接する伝熱管へのジェット噴流による液滴衝撃エロージョン現象を模擬した実験及び解析を行い、基礎データの一つである空気中への高温・高圧の水・蒸気二相自由噴流によって生じる圧力・温度分布に関する測定結果について報告する。

One of the design basis accidents in sodium-cooled fast reactor is sodium-water reaction at steam generator (SG). In case of a defect occurred on a heat transfer tube, the high-pressure water/vapor will spout into the low-pressure sodium surrounding outside the tube. As sodium is ordinarily quite reactive with water, this will initiate sodium-water reactions accompanied by high chemical heat generation. The liquid droplet in the reaction steam outflow would impinge on neighboring tubes to cause erosion, while the chemical reaction will cause corrosion, eventually may lead to secondary tube failure. Focusing on the erosion part, this study is to evaluate the liquid droplet impingement erosion (LDIE) rate on neighboring tubes caused by SG heat transfer tube rupture. In this paper, as a basic study, the pressure and temperature distribution of high -pressure two-phase free jet into the air is measured.